Nitrogen-15 NMR studies of nitrogen metabolism in Picea glauca buds

Bagh, Kirsten; Hiraoki, Toshifumi; Thorpe, Trevor A.; Vogel, Hans J.

doi:10.1016/j.plaphy.2004.09.006

Cited by 13 publications

(9 citation statements)

References 17 publications

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“…3A). Due to AVG being considered as a potential suicide inhibitor of many PLP (or vitamin B 6 )-dependent enzymes (enzymes closely related to the subgroup of I aminotransferases such as ACC synthetase; Werck-Reichhart et al, 1988;Bagh et al, 2004), we have examined whether the root supply of L-Glu (the main product of N assimilation) was able to recover AVG primary and root hair growth inhibition during 3 d of treatment. Indeed, key enzymes of N metabolism such as Gln synthase and transaminases involve PLP as a cofactor and use L-Glu as a substrate or as a product.…”

Section: Ability Of L-glu Treatment To Recover Avg Root Elongation Inmentioning

confidence: 99%

“…This group of aminotransferases can also be inhibited by other PLP inhibitors such as allyl-Gly, MSO, and AOA (Bagh et al, 2004). As a consequence there exists a high degree of uncertainty about the targets and specificity of these inhibitors on PLPdependent enzymes especially on N metabolic aminotransferases using PLP as cofactor.…”

Section: Modulation Of Ethylene Biosynthesis By Avg and Acc Up To 1 Mmentioning

confidence: 99%

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Elongation Changes of Exploratory and Root Hair Systems Induced by Aminocyclopropane Carboxylic Acid and Aminoethoxyvinylglycine Affect Nitrate Uptake andBnNrt2.1andBnNrt1.1Transporter Gene Expression in Oilseed Rape

et al. 2008

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Ethylene is a plant hormone that plays a major role in the elongation of both exploratory and root hair systems. Here, we demonstrate in Brassica napus seedlings that treatments with the ethylene precursor, aminocyclopropane carboxylic acid (ACC) and the ethylene biosynthesis inhibitor, aminoethoxyvinylglycine (AVG), cause modification of the dynamic processes of primary root and root hair elongation in a dose-dependent way. Moreover, restoration of root elongation in AVG-treated seedlings by 1 mM L-glutamate suggested that high concentrations of AVG affect root elongation through nonoverlapping ethylene metabolic pathway involving pyridoxal 5#-P-dependent enzymes of nitrate (N) metabolism. In this respect, treatments with high concentrations of ACC and AVG (10 mM) over 5 d revealed significant differences in relationships between root growth architecture and N uptake capacities. Indeed, if these treatments decreased severely the elongation of the exploratory root system (primary root and lateral roots) they had opposing effects on the root hair system. Although ACC increased the length and number of root hairs, the rate of N uptake and the transcript level of the N transporter BnNrt2.1 were markedly reduced. In contrast, the decrease in root hair length and number in AVG-treated seedlings was overcompensated by an increase of N uptake and BnNrt2.1 gene expression. These root architectural changes demonstrated that BnNrt2.1 expression levels were more correlated to the changes of the exploratory root system than the changes of the root hair system. The difference between treatments in N transporters BnNrt1.1 and BnNrt2

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Section: Ability Of L-glu Treatment To Recover Avg Root Elongation Inmentioning

confidence: 99%

Section: Modulation Of Ethylene Biosynthesis By Avg and Acc Up To 1 Mmentioning

confidence: 99%

Elongation Changes of Exploratory and Root Hair Systems Induced by Aminocyclopropane Carboxylic Acid and Aminoethoxyvinylglycine Affect Nitrate Uptake andBnNrt2.1andBnNrt1.1Transporter Gene Expression in Oilseed Rape

et al. 2008

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“…Nitrogen is used to form glutamine, a precursor of many amino acids, like nucleic acids, alkaloids and polysaccharides, as well as secondary metabolites like PAs (Bagh et al,, 2004). It is generally accepted that many plants display optimal growth and development if nitrogen is available in the form of NO 3 - (Coruzzi and Bush, 2001).…”

Section: Introductionmentioning

confidence: 99%

Ammonium enhances resistance to salinity stress in citrus plants

Fernández-Crespo

Camañes

García‐Agustín

2012

Journal of Plant Physiology

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In this work, we demonstrate that NH 4 + nutrition in citrange Carrizo plants acts as an inducer of resistance against salinity conditions. We investigated its mode of action and provide evidence that NH 4 + confers resistance by priming abscisic acid and polyamines, just as enhancing H 2 O 2 and proline basal content. Moreover it observed a diminished Cl -uptake as well as an enhanced PHGPx expression after salt stress. Control and N-NH 4 + plants have shown optimal growth, however it was observed that N-NH 4 + plants have displayed greater dry weight and total lateral roots than control plants, but that differences are not seen for primary roots length. Our results reveal that N-NH 4 + treatment induces a similar phenotypical response to the recent stress-induced morphogenetic response (SIMRs). The hypothesis is that N-NH 4 + treatment triggers mild chronic stress in citrange Carrizo plants, which might explain the SIMR observed. Moreover, we observed modulators of stress signaling, such as H 2 O 2 in N-NH 4 + plants, which could acts as an intermediary between stress and the development of the SIMR phenotype. This observation suggests that NH 4 + treatments induce a mild stress condition that primes the citrange Carrizo defense response by stress imprinting and confers protection against a subsequent salt stress.

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“…In contrast, recent work has shown that deficiency in inorganic forms of nitrogen inhibits the cell division occurring during elongation of axis II in rice (Luo et al, 2017). Moreover, previous studies have shown that high inorganic forms of nitrogen such as nitrate and ammonium, sustain axis II elongation in vitro in the presence of cytokinins and sucrose in spruce and are assimilated into amino acids (Bagh et al, 2004). A strong elongation occurred when 10 mM of asparagine, a concentration close to that found in the sap (Fig.…”

Section: Asparagine and Sugars Are Involved In Axis II Nutrition And mentioning

confidence: 86%

Asparagine and sugars are both required to sustain secondary axis elongation after bud outgrowth in Rosa hybrida

Moigne

Guérin

Furet

et al. 2018

Journal of Plant Physiology

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Nitrogen-15 NMR studies of nitrogen metabolism in Picea glauca buds

Cited by 13 publications

References 17 publications

Elongation Changes of Exploratory and Root Hair Systems Induced by Aminocyclopropane Carboxylic Acid and Aminoethoxyvinylglycine Affect Nitrate Uptake andBnNrt2.1andBnNrt1.1Transporter Gene Expression in Oilseed Rape

Elongation Changes of Exploratory and Root Hair Systems Induced by Aminocyclopropane Carboxylic Acid and Aminoethoxyvinylglycine Affect Nitrate Uptake andBnNrt2.1andBnNrt1.1Transporter Gene Expression in Oilseed Rape

Ammonium enhances resistance to salinity stress in citrus plants

Asparagine and sugars are both required to sustain secondary axis elongation after bud outgrowth in Rosa hybrida

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